<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>节点的概念</title>
    </head>
    <body>
        <div id="divid" class="div">
            <p class="p">p标签</p>
            <a class="a">a标签</a>
        </div>
    </body>
</html>